A new theoretical method outlined here for an important inelastic mechanism based on A-B + encounters in A-B(n) thermal collisions indicates a substantial contribution to l-changing transitions which therefore cannot be viewed as proceeding via (e-A) encounters alone. Recent descriptions of l-changing thermal collisions which are based on an (e-A) impulse treatment appear defective in that they disregard certain impulse validity criteria and yield results which greatly exceed the upper limit specified by the basic impulse expression, and do not recognise the above important inelastic mechanism associated with the non-inertiality of the core.
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M. R. Flannery (1980) studied this question.